[单选题]
n airplane in straight level 71y u+pkhk+ dymxo/tf0h )z,dfligk00 ngr incb/as ,psjje*.*h,ht experiences a lift force $L$ that is proportional to the speed of the plane and is perpendicular to the axis of the wings and as shown in diagram.
On a banked turn at the same speed, the wings make an angle $θ$ with the horizontal.
Which of the following gives the centripetal force on the airplane?
